I don't think you can pump carbon dioxide into the atmosphere indefinitely and not have a reaction. But there are great scientists such as Freeman Dyson, one of the greatest physicists of the last hundred years, who has studied the question, who believes quite the opposite. The reason transnational action is so difficult is because the major problem with climate change is, A, that there is no consensus, and, B, that the economic cost is simply staggering. Reversing it completely might mean undoing the modern industrial economy.

There's no free lunch. If you want an industrial economy, you need energy. If you want energy, it will produce pollution. You can have it in two forms. You can have it dissipated in the atmosphere - like carbon dioxide - which then you cannot recover, or you can have the waste concentrated in one small space like nuclear. That is far easier to deal with. The idea that you can be able to create renewable energy at a price anywhere near the current price for oil or gas or coal is a fantasy.

The 2014 election has given the GOP the rare opportunity to retroactively redeem its brand. The conventional perception, incessantly repeated by Democrats and the media, is that Washington dysfunction is the work of the Party of No. Expose the real agent of do-nothing. Show that, when Harry Reid can no longer consign House-passed legislation to oblivion, Congress can actually work.

Guerrilla war is a test of wills. Obama's actual objectives - rollback in Iraq, containment in Syria - are not unreasonable. But they require commitment and determination. In other words, will. You can't just make one speech declaring war, then disappear and go fundraising.

I think the first thing is to recognize a mistake that Obama made. And others have made in thinking that you can revolutionize a system that's unbelievably complex and interlinked, one-sixth of the economy. That was a mistake because whenever you change one thing, it changes 80 other things, and now if you're changing everything at once, you have no idea what the outcome is going to be and you get all of these unintended side effects.

When a party is in opposition, it opposes. That's its job. But when it comes to power, it must govern. Easy rhetoric is over, the press of reality becomes irresistible. By necessity, it adopts some of the policies it had once denounced. And a new national consensus is born.

I am not religious. I do not believe that personhood is conferred upon conception. But I also do not believe that a human embryo is the moral equivalent of a hangnail and deserves no more respect than an appendix.